The United States purchased the Louisiana Territory from France.
What is the Louisiana Territory?
The Territory of Louisiana, also known as the Louisiana Territory, was a United States organised incorporated territory that existed from July 4, 1805 to June 4, 1812, when it was renamed the Missouri Territory. The territory was created by combining the District of Louisiana and the portion to the north of the 33rd parallel, the Louisiana Purchase (which is now the Arkansas–Louisiana state line). The Louisiana Purchase eventually doubled the size of the United States, greatly strengthened it materially and strategically, provided a powerful impetus to westward expansion, and confirmed the federal Constitution's doctrine of implied powers.
So, the required answer is France.
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